Damper-regulator for steam-boilers



PATENTBD PEB. 16, 1904.

APPLICATION FILED 1\[AR.30 1903.

NO MODEL.

1 w w m. my qw c Vm@ c l r mf f. L. 1 I l. .N l Y A@ QN um, m\ QM nq Ovmy@ \O.v N M NN w mm @an UNITED STATESN 4Iatented February 16, 1904;

PATENT OFFICE.-

` ISAAC E. OSMAN, OF GREENSBURG, INDIANA.

DAIVIPERREGULATQR FOR STEAM-BOILERS.

SPECIFICATION forming part of LettersPatent No. 752,581, dated February16, 1904.

Application filed. March 30, 1903.

To @ZZ whom t may concern.'

Be it known that I, ISAAC E. OsMAN, a citizen of the United States,residing at Greensburg, in the county ofDecatur and State of Indiana,have invented certain new and useful Improvements in Damper-Regulatorsfor Steam- Boilers, of which the following is a specication.

This invention aims, broadly, to provide efiicient damper-regulatingmeans for use in connection with steam-boilers for controlling throughthe medium of the said damper thev amountof steam-pressure maintained inthe boiler. Y

The special structure utilized is a peculiar form of valve for automaticactuation of a piston, the damper being connected by suitable means tothe piston, which is adapted to close the damper when the pressure ofsteam reaches an ascertained height and to opeh the damper when thepressure lowers, in a manner which will appear more clearly as thedescripi tion proceeds.

l may also be accomplished through adjusting means acting directly uponthe piston, `and the movement of the latter is adapted for adjustablelimitation whereby the regulator may be used in connection with smalland large sized dampers, .requiring variable throws of the piston toopen and close them.

For a full description of the invention and the merits thereof and alsoto acquire aknowledge of the details of construction of the means foreffecting the result reference is to be had to the following descriptionand drawings hereto attached. c

While the essential and characteristic features of the invention aresusceptible of modiiication, still the preferred embodiment of theinvention is illustrated in the accompanying drawings, in which- Figure1 is a sectional view through" the regulating attachment, showing therelative `Serial-No. 150,218. (No model.)

arrangement of the parts. Fig. 2 is a side elevation showing theregulator applied to the rear end of a steam-boiler, and particularly`the connections Vbetween the damper and theV regulator in theirpreferred disposal. Fig. 3

is acsectional view, parts broken away, of the piston, showing the endof the piston-rod adjacent thereto in working position. Fig. 4 is adetail perspective view of the specific form of packing-rings. used uponthe piston.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

The regulator is shown applied to the rear portion of a traction-engineboiler, it being understood, however, that the attachment may beutilized upon any boiler construction. The

boiler 1 is provided witha steam-pipe 2, upon n the upper part thereof,said pipe connecting with the steam-space of the boiler to permit thelregulation of the device by variation in the pressure of the steam, sothat upon excess of this pressure the damper 3 may be closed and thepressure consequently decreased. The lowering of the pressure of thesteam permits automatic'opening of the damper 3 to increase the draftand raise the said pressure to the desired point. Connected to thesteam-pipe 2 4is an ordinary T-pipe 4, fromwhich extend a valve-casing 5and a cylinder 6. The valveleasing 5 is connected to the T-pipe 4 by ascrew-plug 7 and the cylinder to the said casing by a corresponding plug8. The valve 9, disposed `within the valve-casing 5, is of the two-seattype and is adapted for operation by j screw cap 15.

in the upper portion of the valve-casing is adapted to bear against theblock 12, and by manipulation of a screw-cap 15 at the upper end of thecasing the said sleeve serves to clamp the blocks 12 and 10 and theinterposed spacing-ring 16 together against the plug 7 in a manner whichwill be readily apparent. The Valve 9 is provided upon its upper sidewith a tubular portion 17, which receives the lower reduced end portionof the valve-stem 18. An extension upon the lower side of the valve 9moves in the opening in the block 10 and serves to guide the valve to anascertained extent in its longitudinal adjustment. Slots 20 upon thetubular portion 17 of the valve and the lower extension 19 aiiord meansfor passage of the steam to the actuator-piston 21 and through outlets22 at the upper end of the casing and in the cap 15. The valve-stem 18extends within a threaded tubular regulating-stem 23, adjustably mountedin the opening in the The tubular stem 23 bears against a guide-ring 24,which receives the upper portion of the valve-stem 18, and atension-spring 25 is interposed between the guidering 24 and a nut 26,screwed upon the reduced portion of the stem 18. The valve is normallyheld tothe lower seat 11 by the tension of the spring 25, the saidtension ofthe spring 25 being increased or decreased by means ofadjustment of the threaded tubular stem 23, so that the valve 9 is heldto its seat by regulable means which may be so adjusted f that the valveis permitted to move when any ascertained point of pressure of steam isreached within the boiler. A steam-pipe 27 extends from the valve-casingto conduct steam to the cylinder 6 for actuation of the piston 21. Thesteam-pipe 27 directly connects with the plug 8, by which the T-pipe 4and the cylinder 6 are joined, a suitable screw-cap 28 being used, towhich a branch of the pipe 27 is secured. The plug 8 is provided with asteampassage 29 therein,which conveys the steam to the cylinder. Inorder to regulate the amount of steam directed against the piston, aneedlevalve 30 of ordinary type is disposed within the length of thesteam-pipe 27 and may be regulated so as not to permit the steam to passwith too great pressure intothe cylinder, since such pressure would ofcourse cause a quick movement of the piston and perhaps close or openthe damper in a manner which would be detrimental to the working thereofand, indeed, might cause breakage in the connections between the pistonand the said damper. The piston 21 is entirely separate from thepiston-rod 31, being provided with an angular recess 32, in which therounded end portion 33 of the piston-rod 31 works. The structure of thepiston and piston-rod is essentially advantageous in that a certainamount of play is permitted the piston-rod and the binding of the pistonwithin the cylinder is reduced to a minimum. In order to cause thepiston to move in an approximately Vproper position within the cylinder,a guide-ring 34 is located adjacent the roundedV end portion 33 thereof,this guidering being rigidly held in place by any suitable means. Thepiston 21 remains normally in position shown when the damper is heldopen. The end of the cylinder is closed by a screw-cap 35, in which aremounted screwsleeves 36 and 37. The sleeve 36 is provided upon is outerperiphery with screw-threads and is adapted to be adjusted within thesleeve 37, which is threaded both upon its inner and outer peripheries,the inner threaded portion interlocking -with the threaded portion ofthe sleeve 36, and the outer threaded portion cooperating with athreaded opening of the cap to permit of adjustment of the said sleevein and out of the cylinder. The sleeve is closed at its outer end, asshown -at 38, and a tensionspring 39 is disposed between the headed endof the sleeve 36 and guide-ring 34 upon the piston -rod. The spring 39holds the end 33'of the piston-rod in contact with the piston 21 andserves to normally hold the said piston in such a position that thedamper is opened, as illustrated in the drawings, the position of thepiston in Figfl being that in which it normally lies and assumes tomaintain the damper open. The sleeve 37 is a stop-sleeve and limits theoutward movement of the piston to close the damper. This sleeve beingadjustable it may be made to adjustably limit the throw of the piston,and thus adapts the attachment for application to boilers having largeand small dampers, a small damper naturally requiring a comparativelysmall throw of the piston and a large damper the converse. Thepiston-rod 31 connects with a bell-crank lever 40, pivoted to the upperportion of the boiler, and a connecting-rod 41 connects the damper tothe other end of the bell-crank lever 40. In large dampers it isdesirable to use means, such as the spring 42, to bear against an armofthe bell-crank lever 40 to .assist the spring 39, which is disposedwithin the cylinder, to return the piston to its normal position.However, this spring need not be utilized when the device is attached toboilers having small dampers. l The piston is provided with peculiarlyformed and disposed packing-rings 43, as shown in Fig. 4. Thepacking-rings are disposed side by side atintervals along the piston, itbeing preferred to use two widths of packing-rings at each interval. Therings upon which the most wear is received are two in number, as shownat 43, the thickness of the rings 43a together amounting to thethickness or' one of the rings 43, the openings of the double rings notregistering. The outer of the rings 43a is thicker than theinner-disposed ring, since IOO IIO

all the wear is upon this ring when a piston of the character shown inthis attachment is utilized. When the wear is from both ends of thepiston, a double packing-ring would be placed upon either side of thesingle packingring for reasons which will be readily comprehended.

In the operation of the regulator the steam enters at A, passes into thevalve-casing 5, and when the pressure reaches an ascertained height thesteam forces the valve 9 from its lower seat, on which it is normallyheld by the spring 25, and against the upper seat 13. Free passage isthus permitted through the steampipe 27 to the cylinder 6 and againstthe .piston 21. The piston is forced by the pressure of the steamoutward to an extent as limited by the stop-sleeve 37, and thepiston-rod acting upon the bell-crank lever and through the medium ofthe connecting-rod 41 closesithe damper down upon the damper opening.This position is shown in Fig. 2 of the drawings. The fire having gonedown somewhat, the amount of pressure within the steam-space of theboiler decreases. vThis decrease of steam-pressure immediately affectsthe valve 9, and same is moved down upon its lower seat under theinfluence of the spring 25. The steam-pipe connects with thevalve-casing at a point between the location of the valve-seats 11 and13, and thus lowering of the valve to the seat 11 opens the way `to thepassages 20 upon the upper tubular portion 17 of the valve, and thesteam is permitted to escape through this passage to the upper portionof the valvecasing and out through the openings 22 in the cap 15 of saidcasing. Thus the piston within the cylinder isrelieved from the pressureof the steam within the cylinder and is returned automatically throughthe spring 39 to its normal position upon the damper. The regulator isentirely automatic in its operation, and the inventor is not restrictedto the exact formation of the structural parts shown in the drawings,but may change the same to concord with the spirit of the invention andthe scope of the appended claims.

Having thus described the invention, what is claimed as new is- 1. In anautomatic damper-regulator, the

combination with an actuator-piston, a valvement of the guide-ring toregulate the tension of the spring adjacent the valve-stem.

2. In a damper-regulator, the combination with an actuator-piston, foractuation by a pressure medium, valve means for regulation of theaforesaid pressure medium, and means for positive engagement with thepiston to limit the movement thereof, whereby the throw of the pistonmay be adjusted and the regulator means applied to different-sizeddampers.

3. In a damper-regulator, the combination of a cylinder, anactuator-piston arranged therein, for actuation by a pressure medium,valve means for regulation of the aforesaid pressureV medium, andadjustable stop means arranged upon the cylinder and adapted forpositive engagement with the piston to adjustably limit the movementthereof.

In testimony whereof I affix my signature in presence of two witnesses.

ISAAC E. OSMAN. [1.. s] Witnesses:

,DAvD A. MYERS,

ADDIE WILER.

